/Engine/Source/Editor/UnrealEd/Public/Commandlets/AssetRegistryGenerator.h
Sets asset registry from a previous run that is used for iterative cooking.
void SetPreviousAssetRegistry ( [TUniquePtr](API\Runtime\Core\Templates\TUniquePtr)< [FAssetRegistryState](API\Runtime\AssetRegistry\AssetRegistry\FAssetRegistryState) > && PreviousState )